How to heal after a toxic relationship?

I don’t want to be going much into detail. I just left a really toxic relationship that kept me walking on eggshells since May 25. I felt intense guilt; I was in survival mode, I couldn’t work out, see my friends or eat properly because of how miserable I felt. I was crying nearly every day to every other day. I wasn’t able to find any joy in anything.

After being apart for a few weeks some other things came to light. I recently found out that my now ex has used me to cheat on his then girlfriend. I never knew she even existed. He hid messages, twisted stories and lied. I found out he has been lying to me since day 1 basically. He has also cheated on and lied to plenty of other women, I identified at least 4 different women by now who told me the exact same stories, proven with screenshots etc.

It feels like I am still being trapped in survival mode. I don’t really perceive my environment, I can’t find joy, the days are just passing by. I don’t want him back and I don’t miss him, I just want to find out how to heal so I can be my old self again.

Any tips are appreciated.